// var firstName = 'Michael';
// var lastName = 'Jackson';
// var year = 1958;
// export {firstName, lastName, year};

let count = 0;
var add = function () {
    count++
}
var obj = {
    count:10,
    add(){
        obj.count++
    }
}

export {obj}
// commonjs可以重新赋值 es6Module重新赋值会报错 
